Free trials ain't free for the seller. There's a significant amount of work that goes into verifying npubs worthiness to a free trial, besides the cost of the trials itself. And then we're right back in CaPtChAs territory etc. 

I prefer focussing on the UX of:
- Onboarding people you know, with gifted cash to spend, in communities where zaps fly
- Facilitating P2P Fiat 🔄 Cash